On Wed, Dec 22, 2010 at 10:45 AM, John Ragle <[email protected]> wrote:
> On 12/22/2010 11:30 AM, a lister wrote: > > ...When I was little, "grounded grid" was vaunted as the way to use triodes > without needing neutralization... Yep. Remember the bifilar filament chokes? You could go to the ham store, get one of those, a cool litz-wound plate choke, and a bandswitching tank coil, and the variables you needed for a pi-network output, and build a heck of an amp. Another way was the NCL-2000 way, wherein the input circuit was just a 50 ohm resistor and the amp ran in class AB1, using 8122 ceramic tubes. IIRC, about 50 watts of drive was enough. An amp designed that way could use a higher value resistor, show the transceiver a mismatch, and get by with less drive. If you used a 200 ohm resistor and a 4:1 balun, you could probably drive such an amp to the max with 10-15 watts, no step-up stage required. Tony KT0NY ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
